Tricking Landau-Yang: How to obtain the diphoton excess from a vector resonance

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• 作者：Mikael Chala ; Michael Duerr ; Felix Kahlhoefer ; ^{felix.kahlhoefer@desy.de" class="auth_mail" title="E-mail the corresponding author} ; Kai Schmidt-Hoberg
• 关键词：Mostly weak interactions ; beyond standard model
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 April 2016
• 年：2016
• 卷：755
• 期：Complete
• 页码：145-149
• 全文大小：450 K

文摘

We show that contrary to naive expectations the recently observed diphoton excess can be explained by a vector resonance, which decays to a photon and a light scalar s  , followed by a decay of the scalar into two photons: mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316001027&_mathId=si1.gif&_user=111111111&_pii=S0370269316001027&_rdoc=1&_issn=03702693&md5=78bb3cc84b95154f7e8e929621fb3e6c" title="Click to view the MathML source">Z^′→γs→3γmathContainer hidden">mathCode"><math altimg="si1.gif" overflow="scroll">Z′→γs→3γmath>. As the two photons from the scalar decay are highly boosted, the experimental signature is an apparent diphoton final state. In fact all the necessary ingredients are naturally present in mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316001027&_mathId=si2.gif&_user=111111111&_pii=S0370269316001027&_rdoc=1&_issn=03702693&md5=db3732be395a3e0825ca813e8b31b00f" title="Click to view the MathML source">Z^′mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll">Z′math> models: Additional fermions with electroweak quantum numbers are required in order to render the theory anomaly free and naturally induce the required effective couplings, while the hidden Higgs which gives mass to the mathmlsrc">mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316001027&_mathId=si2.gif&_user=111111111&_pii=S0370269316001027&_rdoc=1&_issn=03702693&md5=db3732be395a3e0825ca813e8b31b00f" title="Click to view the MathML source">Z^′mathContainer hidden">mathCode"><math altimg="si2.gif" overflow="scroll">Z′math> can be very light. In particular no new coloured states are required in this framework. We also show that in such a setup the width of the resonance can be rather large, while all couplings remain perturbative.